Just skimmed for now, but yes an interesting topic. You are opening pandoras box. Crystals are very interesting especially because the basis of their energy vibrational (eg. piezoelectricity) ties in to what we are discovering about human consciousness. People are very quick to dismiss crystals and stuff as fantasy, without even considering what our consciousness is. We don't really question our consciousness because it is always been with us. But where does it originate from? where does it end? These are questions without clear answers and people are afraid to venture past "well its all in my brain", but what about the rest of our body it is a single functional unit. Ancient chinese consider the tan tien (area just below naval) as being the true location controller of the body or in other words consciousness.
As far as atlantean crystals I have a hard time buying into the atlantean seed crystal thing, I think that is mostly a marketing gimmick. If you go down that road know that most people are selling a product along with their ideas. I think you would be interested in reading about marcel vogel and the vogel crystal. The crystal he cut looks the same as the one you posted. He says a lot of interesting things about it. I don't know how much I believe though - watching him I've gotten a strange vibe lets just say. He has tons of youtube videos you can watch yourself. In one he claims to have levitated someone using his crystal, but that nobody in the audience reacted to it. But I haven't dismissed him altogether, he's done some interesting shit.
Some other interesting areas:
- Sacred geometry and the relation to crystals and human life - pyramids, etc.
- The Kabbalah (jewish mysticism) and crystal use by illuminati-celebrities like lady gaga.
- Hutchinson crystal cell batteries
I believe there is knowledge about this that is being shielded from the public eye, not necessarily hidden, but its been made something to be laughed at - meanwhile it is used by the rich and powerful. Consider when people choose jewelry they are also taking part in crystal and metal magic. And crystals were used in native american and shaman traditions. As well as the modern baptism deriving from (native americans) cleansing crystals and themselves in a stream. Further I think that crystals aren't the end all be all of spirituality. Ultimately I think it all derives in you and your qi energy.
Are my thoughts on the matter at least. Sorry about going off on a tangent away from atlantis, but there is so much more to crystals I couldn't resist. I think those ancient civilizations like atlanteans and egyptians found a way to really harness the power of crystals. So the modern fascination with crystals is in the right ball park, but it isn't anywhere near the true potential.